CN107762581B - Full-automatic control system and method for screw expansion generator set - Google Patents
Full-automatic control system and method for screw expansion generator set Download PDFInfo
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- CN107762581B CN107762581B CN201711227259.XA CN201711227259A CN107762581B CN 107762581 B CN107762581 B CN 107762581B CN 201711227259 A CN201711227259 A CN 201711227259A CN 107762581 B CN107762581 B CN 107762581B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 230000005284 excitation Effects 0.000 claims abstract description 49
- 230000004224 protection Effects 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000005461 lubrication Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 37
- 239000010687 lubricating oil Substances 0.000 claims description 25
- 238000003860 storage Methods 0.000 claims description 21
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000010248 power generation Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention relates to a full-automatic control system and method of a screw expansion generating set, comprising a central control room upper computer, a self-checking system, an auxiliary lubrication system, a cooling circulating water system, a heat source control system, a liquid level control system, a pressure control system, a main air inlet control system, a screw expansion machine system, an excitation control system, an automatic quasi-synchronization system, a protection switching system, a fault detection system and a data acquisition system, wherein a key start button is arranged on the central control room upper computer, the systems are sequentially and automatically started, when the previous system fails, the fault detection system alarms and stops the next system to start until the next system at a failure removal port can not start.
Description
Technical Field
The invention relates to a power generation control device, in particular to a full-automatic control system of a screw expansion generator set, and further relates to a control method of the system.
Background
A large amount of low-temperature waste heat resources are generated in the carbon disulfide industrial production process, so that the waste of energy sources is avoided, and the heat pollution is a serious environmental problem. In the organic Rankine cycle generator set, the current screw expansion generator set is widely applied, and the main advantage of the screw expansion generator set is that the problems that the traditional steam turbine is high in maintenance cost, complex in system and incapable of being used for saturated steam and wet steam are solved.
At present, the common screw expansion generating set can effectively recycle waste heat resources, but because the total amount of the waste heat resources is large, the single amount is small and the waste heat resources are distributed in a scattered way, the single machine installation capacity of the screw expansion generating set is small, the operation mechanism is three shifts of 6 people of a single generating set, special personnel are required to protect, and the economic burden of enterprises is increased.
Disclosure of Invention
Aiming at the situation, the invention aims to provide a full-automatic control system of a screw expansion generating set, which can ensure that a single generating set only needs to be periodically inspected without special care, so that the personnel cost is reduced, one-key starting and all-weather unmanned on duty are realized, and the economic benefit of the generating set is improved under the condition that the screw expansion generating set is ensured to run safely and stably.
The full-automatic control system of the screw expansion generating set comprises a central control room upper computer, wherein the central control room upper computer is used for collecting, storing, judging and controlling data of the screw expansion generating set, and a key start button is arranged on the central control room upper computer;
automatic detection system: detecting the liquid level in the liquid storage tank through a liquid level meter in the liquid storage tank, transmitting the liquid level to an upper computer of a central control room, detecting the oil level in an oil separator through an oil separator liquid level meter in the oil separator, transmitting the oil level to the upper computer of the central control room, detecting the state of an emergency stop button of a grid-connected control cabinet, transmitting the state of the emergency stop button to the upper computer of the central control room, analyzing data by the upper computer of the central control room, and controlling the liquid storage tank, the oil separator and the emergency stop button according to set values;
auxiliary lubrication system: the method comprises the steps that the outlet pressure of a rotor lubricating oil pump is measured through an oil pump pressure sensor arranged at an outlet of the rotor lubricating oil pump and is transmitted to a central control room upper computer, the rotating speed of a screw expander is measured through a rotating speed sensor arranged on the screw expander and is transmitted to the central control room upper computer, and the central control room upper computer determines whether the lubricating oil pump is started or not according to the rotating speed of the screw expander;
cooling water circulation system: measuring the water level in the cooling circulating water tank through a water level meter in the cooling circulating water tank, measuring the water temperature through a water tank thermometer, transmitting the water temperature to a central control room upper computer, and judging the number value by the central control room upper computer to control the cooling circulating water tank, the circulating water pump, the cooling fan and the variable frequency controller;
a heat source control system: the method comprises the steps that the temperature of a heat source inlet and outlet is measured through a heat source thermometer and a heat source outlet thermometer which are arranged on a heat source pipeline of a screw expansion generating set, data are transmitted to a central control room upper computer, and the central control room upper computer determines the opening of a heat source inlet pipeline regulating valve and the regulation of a heat source bypass regulating valve on a heat source outlet pipeline through judging the temperature difference of the heat source inlet and outlet;
liquid level control system: the liquid level of the evaporator is measured through a liquid level sensor arranged in the evaporator, and the rotating speed of the working medium pump is controlled through a variable frequency controller by a central control room upper computer;
pressure control system: the method comprises the steps that the pressure of an evaporator is measured through an evaporation pressure sensor, data are transmitted to a central control room upper computer, and the central control room upper computer adjusts a bypass electric regulating valve on an exhaust pipeline of the evaporator;
the main air inlet control system comprises: detecting the rotating speed of the screw expander at the system moment, controlling according to the set requirement of the starting-up stage, and controlling the air inlet flow of the screw expander system by adjusting the main air inlet regulating valve according to the set power after the generator is connected;
screw expander system: the screw expander system is in control connection with the upper computer of the central control room, monitors the rotating speed of the screw expander and sends out corresponding instructions;
excitation control system: the excitation control system is arranged in the grid-connected control cabinet, an emergency stop button is arranged on a panel of the grid-connected control cabinet, the excitation control system comprises an excitation controller, an excitation voltage and excitation current detection device, the central control room regulates the excitation voltage and the excitation current after detecting the power grid voltage and the generator voltage through the detection device, and the upper computer of the central control room controls the starting of the excitation control system according to the rotating speed of the screw expander;
automatic quasi-synchronization system: the upper computer of the central control room controls the starting of an automatic quasi-synchronization system according to the rotating speed of the screw expander, and when the frequency, the voltage and the phase angle of the generator and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to finish grid connection;
protection switching system: after the grid connection of the automatic quasi-synchronization system is completed, manually switching to a protection switching system interface;
fault detection system: the whole screw expansion generating set is monitored in the starting and running stage, and when the running parameters deviate from the set values, the system automatically adjusts according to a preset program;
and a data acquisition system: and recording relevant data in the whole process of starting and running stages of the whole screw expansion generating set so that an upper computer of a central control room can give instructions to the system.
Preferably, the protection switching system interface is arranged on a grid-connected control cabinet panel, and switching is performed through manual protection.
Preferably, after the previous system runs safely and stably, the next system is allowed to start, so that the safety of the system is enhanced.
A full-automatic control method of a screw expansion generator set is characterized by comprising the following steps of:
1) Starting a one-key starting button of an upper computer of a central control room, and sequentially detecting by an automatic detection system according to detection items set by a program, wherein the detection items are states of a sudden stop button on a panel of a grid-connected control cabinet, wherein the liquid level of a liquid storage tank detected by a liquid level meter of the liquid storage tank is more than or equal to 600mm, and the oil level of an oil separator detected by the liquid level meter of the oil separator is more than or equal to 400 mm;
2) After the instruction in the step 1) is completed and fed back to the upper computer of the central control room, automatically starting the auxiliary lubrication system: the screw expander bearing lubricating oil pump reacts according to the data detected by the oil pump pressure sensor, and when the set pressure of the oil pump outlet reaches 0.5MPa, the flow of the lubricating oil is automatically regulated; detecting the rotation condition of a screw expander system at any time by a rotor lubricating oil pump, and automatically starting the rotor lubricating oil pump of the screw expander when detecting that the rotation speed of the screw expander reaches 100 rpm;
3) And (3) starting a cooling circulating water system: automatically identifying the water level of a cooling circulating water tank, automatically supplementing water, detecting the temperature and the water level of water in the cooling water circulating water tank by a water tank thermometer and a water tank water level meter, starting a circulating water pump and a cooling fan when the water inlet of the cooling circulating water is more than or equal to 30 ℃, and controlling the cooling fan through frequency conversion when the water inlet of the cooling circulating water is less than or equal to 30 ℃, so that the motor frequency of the cooling fan is reduced, and the self-power consumption of a system is reduced;
4) After the cooling circulating water system is normally started, starting a heat source control system: gradually starting the opening of the heat source inlet regulating valve to a program set initial value of 20%, preheating the screw expansion generating set, when the temperature difference between the inlet and the outlet of the heat source is less than or equal to 3 ℃, finishing the preheating, starting the next step of starting program of the set, and regulating the opening of the heat source bypass regulating valve by the heat source control system according to the set heat source outlet temperature after the set is started, and performing real-time monitoring;
5) After the unit is preheated, a liquid level control system and a pressure control system are started, a working medium pump is automatically started, the working medium pump is controlled through frequency conversion, a positive displacement double-screw working medium pump is adopted, the system detects the liquid level of an evaporator through an evaporator liquid level meter, and when the liquid level reaches a set value of 350mm, the working medium pump controls the rotating speed of the working medium pump through a frequency converter; when the evaporator pressure sensor detects that the evaporator pressure reaches a set value of 1.2MPa, the evaporator pressure is maintained by adjusting the bypass electric regulating valve, and a main air inlet control system is started;
6) The main air inlet control system is started, the rotating speed of the screw expander is controlled by adjusting an air inlet adjusting valve of the screw expander, the rotating speed of the screw expander is detected by the system through a rotating speed sensor at any time, the control is performed according to the set requirement of the starting stage, and after the generator is connected with the grid, the air inlet flow of the screw expander system is controlled by adjusting the main air inlet adjusting valve according to the set power;
7) The screw expander system is started: according to the set starting-up stage of the screw expander, the rotating speed of the screw expander is automatically adjusted according to the size of the working fluid, and the first stage is a preheating stage: controlling the rotating speed of the screw expander to be 100rpm, and when the rotating speed of the screw expander reaches 100rpm, simultaneously starting the rotor lubricating oil pump by the auxiliary lubricating system; the second stage is a speed-up stage, and the screw expander automatically speeds up to 1350rpm; the third stage is a grid connection stage, and the screw expander maintains the rotating speed of the screw expander at 1500rpm by adjusting the air inlet flow;
9) When the rotating speed of the screw expander power generation system reaches 1350rpm, the excitation control system is automatically started, the excitation control system adjusts the excitation voltage and the excitation current according to the detected power grid voltage and the generator voltage, and after grid connection is completed, the excitation control system is always in a working state, and adjusts the excitation voltage and the excitation current according to the set generator power factor;
10 When the rotating speed of the power generation system of the screw expander reaches 1500rpm, an automatic quasi-synchronization system is automatically started, a main air inlet regulating valve is regulated by detecting the frequency, the voltage and the phase angle of the generator and the power grid, and when the frequency, the voltage and the phase angle of the generator and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to finish grid connection;
11 After grid connection is completed, manually switching to a protection switching system interface, and manually switching into various protections according to requirements, wherein the method mainly comprises the following steps of: reverse power protection, liquid level protection of a liquid storage tank, oil level protection of an oil separator, overspeed protection of a generator, overpower protection of the generator, overcurrent protection of the generator, low-speed protection of the generator, overpressure protection of an evaporator and overpressure protection of a condenser;
12 After the starting is finished, the system of the screw expansion generating set automatically operates, when the fault detection system detects that the operation parameters deviate from the set values, the system automatically adjusts according to a preset program, if the system faults occur or the monitoring index exceeds a limit value, the system can be automatically stopped according to the reverse order of the starting program to protect the system, and the data acquisition system records relevant data in the whole process of the starting and operation stages of the whole screw expansion generating set so that the upper computer of the central control room can give instructions to the system.
The full-automatic control system adopts an automatic control technology based on combining the process requirements of the screw expansion generating set and manual step-by-step starting, and adopts a full-automatic linkage and an automatic control method for the control logic relationship in the automatic control technology, so that one-key starting and all-weather unattended operation can be realized, and after each subsystem safely and stably operates, the next system is allowed to start, thereby not only enhancing the safety of the system, but also reducing the operation cost of the screw expansion generating set and improving the economic benefit.
Drawings
FIG. 1 is a block diagram of a fully automatic control system of the present invention;
FIG. 2 is a process flow diagram of a screw expansion generating set of the present invention;
FIG. 3 is a flowchart of the start-up of the fully automatic control system of the present invention;
1, a heat source inlet regulating valve; 2. an evaporator; 3. a main intake regulating valve; 4. a screw expander; 5. a generator; 6. grid-connected control cabinet; 7. a heat source bypass regulating valve; 8. a rotor lubrication pump; 9. a bearing lubrication pump; 10. an oil separator; 11. a cooling fan; 12. a condenser; 13. a circulating water pump; 14. a cooling circulation water tank; 15. a working medium pump; 16. a liquid storage tank; 17. an evaporator level gauge; 18. an oil separator level gauge; 19. a liquid level meter of the liquid storage tank; 20. a rotation speed sensor; 21. a condenser pressure sensor; 22. a water tank thermometer; 23. an oil pump pressure sensor; 24. an evaporator pressure sensor; 25. a bypass electric control valve; 26. a water tank level gauge; 27. a heat source inlet thermometer; 28. a heat source outlet thermometer.
Detailed Description
As shown in fig. 1, 2 and 3, the full-automatic control system of the screw expansion generating set comprises a central control room upper computer, wherein the central control room upper computer is used for collecting, storing, judging and controlling data of the screw expansion generating set, and is provided with a key start button;
automatic detection system: the liquid level in the liquid storage tank 16 is detected through a liquid storage tank liquid level meter 19 in the liquid storage tank 16 and is transmitted to a central control room upper computer, the oil level in the oil separator 10 is detected through an oil separator liquid level meter 18 in the oil separator 10 and is transmitted to the central control room upper computer, the state of an emergency stop button of the grid-connected control cabinet 6 is detected and is transmitted to the central control room upper computer, and the central control room upper computer analyzes data and controls the liquid storage tank, the oil separator 10 and the emergency stop button according to set values;
auxiliary lubrication system: the outlet pressure of the rotor lubricating oil pump 8 is measured through an oil pump pressure sensor 23 arranged at the outlet of the rotor lubricating oil pump 8 and is transmitted to a central control room upper computer, the rotating speed of the screw expander 4 is measured through a rotating speed sensor 20 arranged on the screw expander 4 and is transmitted to the central control room upper computer, and the central control room upper computer determines whether the rotor lubricating oil pump 8 is started or not according to the rotating speed of the screw expander 4;
cooling water circulation system: the water level in the cooling circulation water tank 14 is measured through a water tank water level meter 26 in the cooling circulation water tank 14, the water temperature of the cooling circulation water tank 14 is measured through a water tank thermometer 22, and the numerical value is transmitted to a central control room upper computer, and the central control room upper computer judges the numerical value to control the cooling circulation water tank 14, the circulating water pump 13 and the cooling fan 11;
a heat source control system: the temperature of a heat source inlet and outlet is measured through a heat source inlet thermometer 27 and a heat source outlet thermometer 28 which are arranged on a heat source pipeline of the screw expansion generating set, data are transmitted to a central control room upper computer, and the central control room upper computer determines the opening of the heat source inlet regulating valve 1 and the regulation of a heat source bypass regulating valve 7 on the heat source outlet pipeline through judging the temperature difference of the heat source inlet and outlet;
liquid level control system: the liquid level of the evaporator 2 is measured by an evaporator liquid level meter 17 arranged in the evaporator 2, and the rotating speed of the working medium pump 15 is controlled by a central control room upper computer through a variable frequency controller;
pressure control system: the pressure of the evaporator 2 is measured by an evaporator pressure sensor 24 and data is transmitted to a central control room upper computer, and the central control room upper computer adjusts a bypass electric regulating valve 25 on an exhaust pipeline of the evaporator 2;
the main air inlet control system comprises: the rotor lubricating oil pump 8 detects the rotating speed of the screw expander 4 at any time, controls according to the set requirement of the starting-up stage, and controls the air inlet flow of the screw expander 4 system by adjusting the main air inlet regulating valve 3 according to the set power after the generator 5 is connected with the power grid;
screw expander system: the screw expander system is in control connection with the upper computer of the central control room, monitors the rotating speed of the screw expander 1 and sends out corresponding instructions;
excitation control system: the excitation control system is arranged in the grid-connected control cabinet 6, an emergency stop button is arranged on a panel of the grid-connected control cabinet, the excitation control system comprises an excitation controller, an excitation voltage and excitation current detection device, the excitation voltage and the excitation current are regulated after the central control room detects the power grid voltage and the generator voltage through the detection device, and the central control room upper computer controls the starting of the excitation control system according to the rotating speed of the screw expander;
automatic quasi-synchronization system: the upper computer of the central control room controls the starting of an automatic quasi-synchronization system according to the rotating speed of the screw expander 4, and when the frequency, the voltage and the phase angle of the generator 5 and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to finish grid connection;
protection switching system: after the grid connection of the automatic quasi-synchronization system is completed, manually switching to a protection switching system interface;
fault detection system: the whole screw expansion generating set is monitored in the starting and running stage, and when the running parameters deviate from the set values, the system automatically adjusts according to a preset program;
and a data acquisition system: and recording relevant data in the whole process of starting and running stages of the whole screw expansion generating set so that an upper computer of a central control room can give instructions to the system.
When the method is implemented, 1) a one-key start button of an upper computer of a central control room is started, an automatic detection system sequentially detects according to detection items set by a program, wherein the detection items are states of a sudden stop button on a panel of a grid-connected control cabinet 6, wherein the liquid level of a liquid storage tank 16 detected by a liquid storage tank liquid level meter 19 is more than or equal to 600mm, the oil level of an oil separator 10 detected by an oil separator liquid level meter 18 is more than or equal to 400 mm;
2) After the instruction in the step 1) is completed and fed back to the upper computer of the central control room, automatically starting the auxiliary lubrication system: the screw expander rotor lubricating oil pump 8 reacts according to the data detected by the oil pump pressure sensor 23, and when the set pressure of the oil pump outlet reaches 0.5MPa, the flow of the lubricating oil is automatically regulated; the rotor lubricating oil pump 8 detects the rotation condition of the screw expander system at any time, and when detecting that the rotation speed of the screw expander 4 reaches 100rpm, the rotor lubricating oil pump of the screw expander is automatically started;
3) And (3) starting a cooling circulating water system: the water level of the cooling circulating water tank 14 is automatically identified, automatic water supplementing is carried out, the temperature and the water level of water in the cooling water circulating water tank 4 are detected by the water tank thermometer 22 and the water tank water level meter 26, when the water inlet of the cooling circulating water is more than or equal to 30 ℃, the circulating water pump 13 and the cooling fan 11 are started, when the water inlet of the cooling circulating water is less than or equal to 30 ℃, the cooling fan 11 is controlled through frequency conversion, the motor frequency of the cooling fan 11 is reduced, and the self-consumption of the system is reduced;
4) After the cooling circulating water system is normally started, starting a heat source control system: gradually opening the heat source inlet regulating valve 1 to a program set initial value of 20%, preheating the screw expansion generating set, when the temperature difference between the inlet and the outlet of the heat source is less than or equal to 3 ℃, finishing preheating, starting the next step of starting program of the set, and regulating the opening of the heat source bypass regulating valve 7 according to the set heat source outlet temperature by the heat source control system after the set is started, and performing real-time monitoring;
5) After the unit is preheated, a liquid level control system and a pressure control system are started, a working medium pump 15 is automatically started, the working medium pump 15 is controlled by frequency conversion, a positive displacement double-screw working medium pump is adopted, the system detects the liquid level of the evaporator 2 through the liquid level of the evaporator, 17, and when the liquid level reaches a set value of 350mm, the working medium pump 15 controls the rotating speed of the evaporator through a frequency converter; when the evaporator pressure sensor 24 detects that the pressure of the evaporator 2 reaches the set value of 1.2MPa, the bypass electric control valve 25 is regulated to maintain the pressure of the evaporator 2, and the main air inlet control system is started;
6) The main air inlet control system is started, the rotating speed of the screw expander 4 is controlled by adjusting the main air inlet adjusting valve 3 of the screw expander, the rotating speed of the screw expander is detected by the rotating speed sensor 20 at any moment, the control is performed according to the set requirement of the starting stage, and after the generator 5 is connected with the grid, the air inlet flow of the screw expander system is controlled by adjusting the main air inlet adjusting valve 3 according to the set power;
7) The screw expander system is started: according to the set starting-up stage of the screw expander, the rotating speed of the screw expander is automatically adjusted according to the size of the working fluid, and the first stage is a preheating stage: controlling the rotating speed of the screw expander to be 100rpm, and when the rotating speed of the screw expander reaches 100rpm, simultaneously starting the rotor lubricating oil pump 8 by the auxiliary lubricating system; the second stage is a speed-up stage, and the screw expander automatically speeds up to 1350rpm; the third stage is a grid connection stage, and the screw expander maintains the rotating speed of the screw expander at 1500rpm by adjusting the air inlet flow;
9) When the rotating speed of the screw expander power generation system reaches 1350rpm, the excitation control system is automatically started, the excitation control system adjusts the excitation voltage and the excitation current according to the detected power grid voltage and the generator voltage, and after grid connection is completed, the excitation control system is always in a working state, and adjusts the excitation voltage and the excitation current according to the set generator power factor;
10 When the rotating speed of the power generation system of the screw expander reaches 1500rpm, an automatic quasi-synchronization system is automatically started, a main air inlet regulating valve is regulated by detecting the frequency, the voltage and the phase angle of the generator 5 and a power grid, and when the frequency, the voltage and the phase angle of the generator 5 and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to complete grid connection;
11 After grid connection is completed, manually switching to a protection switching system interface, and manually switching into various protections according to requirements, wherein the method mainly comprises the following steps of: reverse power protection, liquid level protection of a liquid storage tank 16, oil level protection of an oil separator 10, overspeed protection of a generator 5, over-power protection of the generator 5, over-current protection of the generator 5, low-speed protection of the generator 5, overpressure protection of an evaporator 2 and overpressure protection of a condenser 12;
12 After the starting is finished, the system of the screw expansion generating set automatically operates, when the fault detection system detects that the operation parameters deviate from the set values, the system automatically adjusts according to a preset program, if the system faults occur or the monitoring index exceeds a limit value, the system can be automatically stopped according to the reverse order of the starting program to protect the system, and the data acquisition system records relevant data in the whole process of the starting and operation stages of the whole screw expansion generating set so that the upper computer of the central control room can give instructions to the system.
The system of the invention uploads the data to the central control room upper computer in a network transmission mode, the central control room upper computer centrally manages the data, and simultaneously, the operation of the screw expansion generator set is coordinated and controlled according to the data feedback condition, thereby realizing the full-automatic management of the screw expansion generator set.
Claims (1)
1. The full-automatic control system of the screw expansion generating set is characterized by comprising a central control room upper computer, wherein the central control room upper computer is used for collecting, storing, judging and controlling data of the screw expansion generating set, and a key start button is arranged on the central control room upper computer;
automatic detection system: detecting the liquid level in the liquid storage tank through a liquid level meter in the liquid storage tank, transmitting the liquid level to an upper computer of a central control room, detecting the oil level in an oil separator through an oil separator liquid level meter in the oil separator, transmitting the oil level to the upper computer of the central control room, detecting the state of an emergency stop button of a grid-connected control cabinet, transmitting the state of the emergency stop button to the upper computer of the central control room, analyzing data by the upper computer of the central control room, and controlling the liquid storage tank, the oil separator and the emergency stop button according to set values;
auxiliary lubrication system: the method comprises the steps that the outlet pressure of a rotor lubricating oil pump is measured through an oil pump pressure sensor arranged at an outlet of the rotor lubricating oil pump and is transmitted to a central control room upper computer, the rotating speed of a screw expander is measured through a rotating speed sensor arranged on the screw expander and is transmitted to the central control room upper computer, and the central control room upper computer determines whether the lubricating oil pump is started or not according to the rotating speed of the screw expander;
cooling water circulation system: measuring the water level in the cooling circulating water tank through a water level meter in the cooling circulating water tank, measuring the water temperature through a water tank thermometer, transmitting the water temperature to a central control room upper computer, and judging the number value by the central control room upper computer to control the cooling circulating water tank, the circulating water pump, the cooling fan and the variable frequency controller;
a heat source control system: the method comprises the steps that the temperature of a heat source inlet and outlet is measured through a heat source thermometer and a heat source outlet thermometer which are arranged on a heat source pipeline of a screw expansion generating set, data are transmitted to a central control room upper computer, and the central control room upper computer determines the opening of a heat source inlet pipeline regulating valve and the regulation of a heat source bypass regulating valve on a heat source outlet pipeline through judging the temperature difference of the heat source inlet and outlet;
liquid level control system: the liquid level of the evaporator is measured through a liquid level sensor arranged in the evaporator, and the rotating speed of the working medium pump is controlled through a variable frequency controller by a central control room upper computer;
pressure control system: the method comprises the steps that the pressure of an evaporator is measured through an evaporation pressure sensor, data are transmitted to a central control room upper computer, and the central control room upper computer adjusts a bypass electric regulating valve on an exhaust pipeline of the evaporator;
the main air inlet control system comprises: detecting the rotating speed of the screw expander at the system moment, controlling according to the set requirement of the starting-up stage, and controlling the air inlet flow of the screw expander system by adjusting the main air inlet regulating valve according to the set power after the generator is connected;
screw expander system: the screw expander system is in control connection with the upper computer of the central control room, monitors the rotating speed of the screw expander and sends out corresponding instructions;
excitation control system: the excitation control system is arranged in the grid-connected control cabinet, an emergency stop button is arranged on a panel of the grid-connected control cabinet, the excitation control system comprises an excitation controller, an excitation voltage and excitation current detection device, the central control room regulates the excitation voltage and the excitation current after detecting the power grid voltage and the generator voltage through the detection device, and the upper computer of the central control room controls the starting of the excitation control system according to the rotating speed of the screw expander;
automatic quasi-synchronization system: the upper computer of the central control room controls the starting of an automatic quasi-synchronization system according to the rotating speed of the screw expander, and when the frequency, the voltage and the phase angle of the generator and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to finish grid connection;
protection switching system: after the grid connection of the automatic quasi-synchronization system is completed, manually switching to a protection switching system interface;
fault detection system: the whole screw expansion generating set is monitored in the starting and running stage, and when the running parameters deviate from the set values, the system automatically adjusts according to a preset program;
and a data acquisition system: recording relevant data in the whole process of starting and running stages of the whole screw expansion generating set so that an upper computer of a central control room can give instructions to the system;
the protection switching system interface is arranged on a grid-connected control cabinet panel and is switched through manual protection;
after the previous system runs safely and stably, the next system is allowed to be started, so that the safety of the system is enhanced;
the control method of the full-automatic control system of the screw expansion generating set comprises the following steps:
1) Starting a one-key starting button of an upper computer of a central control room, and sequentially detecting by an automatic detection system according to detection items set by a program, wherein the detection items are states of a sudden stop button on a panel of a grid-connected control cabinet, wherein the liquid level of a liquid storage tank detected by a liquid level meter of the liquid storage tank is more than or equal to 600mm, and the oil level of an oil separator detected by the liquid level meter of the oil separator is more than or equal to 400 mm;
2) After the instruction in the step 1) is completed and fed back to the upper computer of the central control room, automatically starting the auxiliary lubrication system: the screw expander bearing lubricating oil pump reacts according to the data detected by the oil pump pressure sensor, and when the set pressure of the oil pump outlet reaches 0.5MPa, the flow of the lubricating oil is automatically regulated; detecting the rotation condition of a screw expander system at any time by a rotor lubricating oil pump, and automatically starting the rotor lubricating oil pump of the screw expander when detecting that the rotation speed of the screw expander reaches 100 rpm;
3) And (3) starting a cooling circulating water system: automatically identifying the water level of a cooling circulating water tank, automatically supplementing water, detecting the temperature and the water level of water in the cooling water circulating water tank by a water tank thermometer and a water tank water level meter, starting a circulating water pump and a cooling fan when the water inlet of the cooling circulating water is more than or equal to 30 ℃, and controlling the cooling fan through frequency conversion when the water inlet of the cooling circulating water is less than or equal to 30 ℃, so that the motor frequency of the cooling fan is reduced, and the self-power consumption of a system is reduced;
4) After the cooling circulating water system is normally started, starting a heat source control system: gradually starting the opening of the heat source inlet regulating valve to a program set initial value of 20%, preheating the screw expansion generating set, when the temperature difference between the inlet and the outlet of the heat source is less than or equal to 3 ℃, finishing the preheating, starting the next step of starting program of the set, and regulating the opening of the heat source bypass regulating valve by the heat source control system according to the set heat source outlet temperature after the set is started, and performing real-time monitoring;
5) After the unit is preheated, a liquid level control system and a pressure control system are started, a working medium pump is automatically started, the working medium pump is controlled through frequency conversion, a positive displacement double-screw working medium pump is adopted, the system detects the liquid level of an evaporator through an evaporator liquid level meter, and when the liquid level reaches a set value of 350mm, the working medium pump controls the rotating speed of the working medium pump through a frequency converter; when the evaporator pressure sensor detects that the evaporator pressure reaches a set value of 1.2MPa, the evaporator pressure is maintained by adjusting the bypass electric regulating valve, and a main air inlet control system is started;
6) The main air inlet control system is started, the rotating speed of the screw expander is controlled by adjusting an air inlet adjusting valve of the screw expander, the rotating speed of the screw expander is detected by the system through a rotating speed sensor at any time, the control is performed according to the set requirement of the starting stage, and after the generator is connected with the grid, the air inlet flow of the screw expander system is controlled by adjusting the main air inlet adjusting valve according to the set power;
7) The screw expander system is started: according to the set starting-up stage of the screw expander, the rotating speed of the screw expander is automatically adjusted according to the size of the working fluid, and the first stage is a preheating stage: controlling the rotating speed of the screw expander to be 100rpm, and when the rotating speed of the screw expander reaches 100rpm, simultaneously starting the rotor lubricating oil pump by the auxiliary lubricating system; the second stage is a speed-up stage, and the screw expander automatically speeds up to 1350rpm; the third stage is a grid connection stage, and the screw expander maintains the rotating speed of the screw expander at 1500rpm by adjusting the air inlet flow;
9) When the rotating speed of the screw expander power generation system reaches 1350rpm, the excitation control system is automatically started, the excitation control system adjusts the excitation voltage and the excitation current according to the detected power grid voltage and the generator voltage, and after grid connection is completed, the excitation control system is always in a working state, and adjusts the excitation voltage and the excitation current according to the set generator power factor;
10 When the rotating speed of the power generation system of the screw expander reaches 1500rpm, an automatic quasi-synchronization system is automatically started, a main air inlet regulating valve is regulated by detecting the frequency, the voltage and the phase angle of the generator and the power grid, and when the frequency, the voltage and the phase angle of the generator and the power grid meet the grid-connected conditions, the automatic quasi-synchronization system sends a grid-connected instruction to finish grid connection;
11 After grid connection is completed, manually switching to a protection switching system interface, and manually switching into various protections according to requirements, wherein the method mainly comprises the following steps of: reverse power protection, liquid level protection of a liquid storage tank, oil level protection of an oil separator, overspeed protection of a generator, overpower protection of the generator, overcurrent protection of the generator, low-speed protection of the generator, overpressure protection of an evaporator and overpressure protection of a condenser;
12 After the starting is finished, the system of the screw expansion generating set automatically operates, when the fault detection system detects that the operation parameters deviate from the set values, the system automatically adjusts according to a preset program, if the system faults occur or the monitoring index exceeds a limit value, the system can be automatically stopped according to the reverse order of the starting program to protect the system, and the data acquisition system records relevant data in the whole process of the starting and operation stages of the whole screw expansion generating set so that the upper computer of the central control room can give instructions to the system.
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| CN109441560B (en) * | 2019-01-07 | 2023-12-29 | 贵州电网有限责任公司 | Air inlet adjusting system and method of expansion generator |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102597433A (en) * | 2009-07-15 | 2012-07-18 | 再生工程有限责任公司 | Systems and methods for increasing the efficiency of a kalina cycle |
| EP2520771A1 (en) * | 2011-05-03 | 2012-11-07 | Technische Universität München | Method and device for quick oil heating for oil-lubricated expansion machines |
| CN104564188A (en) * | 2014-12-29 | 2015-04-29 | 南京凯盛开能环保能源有限公司 | Full-automatic control method and full-automatic control system for cement waste heat power generation station |
| CN104847525A (en) * | 2015-04-10 | 2015-08-19 | 北京工业大学 | Vehicle organic Rankine cycle waste heat recovery system capable of automatically switching working modes based on working conditions |
| CN106907201A (en) * | 2016-12-27 | 2017-06-30 | 华北电力大学 | A kind of unattended formula organic Rankine bottoming cycle isolated network power generation monitoring system and method |
| CN107355273A (en) * | 2017-08-23 | 2017-11-17 | 天津商业大学 | A kind of intelligent controlling device applied to organic rankine cycle system |
| CN107387176A (en) * | 2017-08-21 | 2017-11-24 | 山西铁峰化工有限公司 | A kind of device and method that step screw expansion generating is carried out using steam waste heat |
-
2017
- 2017-11-29 CN CN201711227259.XA patent/CN107762581B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102597433A (en) * | 2009-07-15 | 2012-07-18 | 再生工程有限责任公司 | Systems and methods for increasing the efficiency of a kalina cycle |
| EP2520771A1 (en) * | 2011-05-03 | 2012-11-07 | Technische Universität München | Method and device for quick oil heating for oil-lubricated expansion machines |
| CN104564188A (en) * | 2014-12-29 | 2015-04-29 | 南京凯盛开能环保能源有限公司 | Full-automatic control method and full-automatic control system for cement waste heat power generation station |
| CN104847525A (en) * | 2015-04-10 | 2015-08-19 | 北京工业大学 | Vehicle organic Rankine cycle waste heat recovery system capable of automatically switching working modes based on working conditions |
| CN106907201A (en) * | 2016-12-27 | 2017-06-30 | 华北电力大学 | A kind of unattended formula organic Rankine bottoming cycle isolated network power generation monitoring system and method |
| CN107387176A (en) * | 2017-08-21 | 2017-11-24 | 山西铁峰化工有限公司 | A kind of device and method that step screw expansion generating is carried out using steam waste heat |
| CN107355273A (en) * | 2017-08-23 | 2017-11-17 | 天津商业大学 | A kind of intelligent controlling device applied to organic rankine cycle system |
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